The decision
Count early starts, not miles.
Glacier’s west and east sides are close enough to tempt one-base planning and different enough to punish it. The question is not whether a road connects them. The question is how many mornings you are willing to spend retracing it.
If one eastern trailhead is a maybe, stay west and make a day of it. If two or more eastern mornings are central to the trip, the second cabin starts earning its cleaning fee.
A move should simplify the next two days. If it only improves one dinner or one view, keep the original key.
The pairing
Give each cabin a different job.
The first stay should absorb arrival: straightforward check-in, groceries nearby, a forgiving road after dark, and enough counter space to sort food and hiking gear. Columbia Falls often makes sense because the practical errands are easy.
The second stay should reduce friction: a shorter approach to the eastern valleys, reliable heat, a simple kitchen, and a porch that makes an early return feel like a choice rather than a loss. St. Mary or Babb can do that job, provided you understand what is open during your travel week.
Transfer day
Do not turn checkout into an administrative holiday.
Pack one small transfer bag before leaving home. Put the day’s layers, chargers, toiletries, and tomorrow’s hiking clothes in it. Everything else stays packed. Buy the second half’s groceries before leaving the larger service towns.
Use a lake stop, short walk, or scenic drive as the bridge between cabins. Avoid placing the trip’s most weather-sensitive hike or hardest-to-replace reservation on this day. The move already supplies enough timing.
The cabin question
Ask what closes, not only what is nearby.
“Near groceries” is less useful than the name of the store and its seasonal hours. “Easy access” should become road surface, final-mile grade, and low-clearance suitability. On the east side, ask about wind, heat, hot water, and cell service. These are not lesser details. They decide whether the cabin feels remote in the good way.
Continue planning
Build the trip from the two morning routes.
Compare West Glacier and St. Mary